TITLE: GCN CIRCULAR NUMBER: 10159 SUBJECT: GRB 091111: a faint long GRB detected with INTEGRAL DATE: 09/11/12 10:43:53 GMT FROM: Diego Gotz at CEA D. Gotz (CEA-Saclay), E.Bozzo, C. Baldovin (ISDC, Versoix), S.Mereghetti, A.Paizis (IASF-Milano), M. Beck, (ISDC, Versoix), C. Ferrigno (ISDC, Versoix/IAAT, Tuebingen) and J.Borkowski (CAMK, Torun) on behalf of the IBAS Localization Team report: a long faint and soft gamma-ray burst has been detected by the INTEGRAL Burst Alert System in IBIS/ISGRI data on November 11 2009. Due to its faintness no automatic alert has been issued and the GRB has been identified through the routine off-line analysis of the low significance triggers. The GRB starts at 15:21:59 U.T. and lasts for about 100 s. The GRB coordinates (J2000) are R.A. : 137.8133 [degrees] , Dec.: -45.9093 [degrees] with a 90% c.l. radius unercainty of 2.5 arcmin. Even if no known X-ray source is present in the IBAS error circle, we note that the low galactic latitude of the object and its soft X-ray spectrum may indicate also a Galactic transient origin. The light curve of the GRB will be posted at http://ibas.iasf-milano.inaf.it/IBAS_Results.html This message can be cited. [GCN OPS NOTE(12nov09): Per author's request, CB was added to the author list.]